Annual report pursuant to Section 13 and 15(d)

Debt and Interest Rate Swap (Details)

v3.20.4
Debt and Interest Rate Swap (Details) - USD ($)
5 Months Ended 12 Months Ended 38 Months Ended 44 Months Ended
May 12, 2024
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2020
Jul. 31, 2020
Nov. 03, 2017
May 12, 2017
Debt Instrument [Line Items]                    
Derivative, Fixed Interest Rate   4.25% 4.25%     4.25% 4.25%   1.74685%  
Derivative Asset       $ (40,000.00)            
Document Period End Date     Dec. 31, 2020              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)     $ 122,000 $ (1,660,000) $ 900,000          
Incremental Loans                   $ 160,000,000.0
Debt Instrument, Payment Terms   0.25% 0.25%     0.25% 0.25%      
Debt Instrument, Term     7 years              
Debt Instrument, Call Feature     1.0% soft call premium              
Debt Instrument, Interest Rate, Effective Percentage   4.40% 4.40% 4.90%   4.40% 4.40%     4.60%
Long-term Debt, Fair Value   $ 376,100,000 $ 376,100,000 $ 214,600,000   $ 376,100,000 $ 376,100,000     $ 398,500,000
Debt Issuance Costs, Gross                   6,000,000.0
Amortization of Debt Discount (Premium)     400,000 300,000 300,000          
Amortization of Debt Issuance Costs     1,100,000 900,000 800,000          
Debt Instrument, Unamortized Discount                   (2,100,000)
Long-term Debt   369,812,000 369,812,000     369,812,000 369,812,000      
Long-term debt   363,592,000 363,592,000 206,909,000   363,592,000 363,592,000      
Long-Term Debt, Maturity, Year One   0 0     0 0      
Long-Term Debt, Maturity, Year Two   15,312,000 15,312,000     15,312,000 15,312,000      
Long-Term Debt, Maturity, Year Three   142,500,000 142,500,000     142,500,000 142,500,000      
Long-Term Debt, Maturity, Year Four   212,000,000 212,000,000     212,000,000 212,000,000      
Debt, Current   0 0     0 0      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax     $ 225,000 (1,319,000) $ 702,000 100,000        
Debt Instrument, Covenant Description     The Incremental Term Loan is subject to a financial covenant of an initial maximum total net leverage ratio of 3.5 to 1 which decreases to 3.0 to 1 beginning with the sixth full fiscal quarter ending after July 31, 2020. During any period during which the Company (i) fails to maintain a public corporate rating from S&P that is equal to or higher than BB- and a public corporate rating from Moody's that is equal to or higher than Ba3 or (ii) fails to maintain a total leverage ratio of 3.0 to 1 or less, the applicable margin will increase to 4.75% in the case of LIBOR Rate loans and 3.75% in the case of Base Rate loans.              
Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     base rate              
Debt Instrument, Basis Spread on Variable Rate     1.50%              
Fed Funds Effective Rate Overnight Index Swap Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     the federal funds rate, plus 0.50%              
Prime Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     prime rate              
London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate     2.50%              
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     an adjusted LIBOR rate determined on the basis of a one- three- or six-month interest period, plus 1.0%              
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate Terms     an adjusted LIBOR rate, subject to a floor of 0.75%              
London Interbank Offered Rate (LIBOR) Subject to Floor [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate     2.50%              
Term B [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt, Gross   212,000,000 $ 212,000,000 212,000,000   212,000,000 212,000,000      
Repayments of Debt             (213,000,000.0)      
TermAloan1 [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt, Gross   157,812,000 $ 157,812,000 0   $ 157,812,000 $ 157,812,000      
Incremental Loans               $ 175,000,000.0    
Repayments of Debt   $ (17,200,000)                
Debt Instrument, Interest Rate, Effective Percentage               3.20%    
Long-term Debt, Fair Value               $ 181,100,000    
Debt Issuance Costs, Gross               1,800,000    
Debt Instrument, Unamortized Discount               $ (900,000)    
TermAloan1 [Member] | Debt amortization period 1 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Payment Terms   1.25% 1.25%     1.25% 1.25%      
TermAloan1 [Member] | Debt amortization, period 2 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Payment Terms   2.50% 2.50%     2.50% 2.50%      
TermAloan1 [Member] | Debt amortization period 3 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Payment Terms   3.75% 3.75%     3.75% 3.75%      
TermAloan1 [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate     3.25%              
TermAloan1 [Member] | London Interbank Offered Rate (LIBOR) Subject to Floor [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate     4.25%              
Medium-term Notes [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt, Gross   $ 369,812,000 $ 369,812,000 212,000,000   $ 369,812,000 $ 369,812,000     $ 425,000,000.0
Debt Instrument, Unamortized Discount   (1,767,000) (1,767,000) (1,328,000)   (1,767,000) (1,767,000)      
Debt Issuance Costs, Net   (4,453,000) (4,453,000) (3,763,000)   (4,453,000) (4,453,000)      
Long-term Debt   363,592,000 363,592,000 206,909,000   363,592,000 363,592,000      
Long-term Debt, Current Maturities   0 0 0   0 0      
Long-term debt   $ 363,592,000 $ 363,592,000 $ 206,909,000   $ 363,592,000 $ 363,592,000      
Forecast [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Frequency of Periodic Payment quarterly installments